// NewConfig returns a new configuration object for the given architecture.
func NewConfig(arch string, fe Frontend, ctxt *obj.Link, optimize bool) *Config {
c := &Config{arch: arch, fe: fe}
switch arch {
case "amd64":
c.IntSize = 8
c.PtrSize = 8
c.lowerBlock = rewriteBlockAMD64
c.lowerValue = rewriteValueAMD64
c.registers = registersAMD64[:]
case "386":
c.IntSize = 4
c.PtrSize = 4
c.lowerBlock = rewriteBlockAMD64
c.lowerValue = rewriteValueAMD64 // TODO(khr): full 32-bit support
case "arm":
c.IntSize = 4
c.PtrSize = 4
c.lowerBlock = rewriteBlockARM
c.lowerValue = rewriteValueARM
c.registers = registersARM[:]
default:
fe.Unimplementedf(0, "arch %s not implemented", arch)
}
c.ctxt = ctxt
c.optimize = optimize
// Don't use Duff's device on Plan 9, because floating
// point operations are not allowed in note handler.
if obj.Getgoos() == "plan9" {
c.noDuffDevice = true
}
// Assign IDs to preallocated values/blocks.
for i := range c.values {
c.values[i].ID = ID(i)
}
for i := range c.blocks {
c.blocks[i].ID = ID(i)
}
c.logfiles = make(map[string]*os.File)
// cutoff is compared with product of numblocks and numvalues,
// if product is smaller than cutoff, use old non-sparse method.
// cutoff == 0 implies all sparse.
// cutoff == -1 implies none sparse.
// Good cutoff values seem to be O(million) depending on constant factor cost of sparse.
// TODO: get this from a flag, not an environment variable
c.sparsePhiCutoff = 2500000 // 0 for testing. // 2500000 determined with crude experiments w/ make.bash
ev := os.Getenv("GO_SSA_PHI_LOC_CUTOFF")
if ev != "" {
v, err := strconv.ParseInt(ev, 10, 64)
if err != nil {
fe.Fatalf(0, "Environment variable GO_SSA_PHI_LOC_CUTOFF (value '%s') did not parse as a number", ev)
}
c.sparsePhiCutoff = uint64(v) // convert -1 to maxint, for never use sparse
}
return c
}
func betypeinit() {
if obj.Getgoarch() == "amd64p32" {
addptr = x86.AADDL
movptr = x86.AMOVL
leaptr = x86.ALEAL
cmpptr = x86.ACMPL
}
if gc.Ctxt.Flag_dynlink || obj.Getgoos() == "nacl" {
resvd = append(resvd, x86.REG_R15)
}
if gc.Ctxt.Framepointer_enabled || obj.Getgoos() == "nacl" {
resvd = append(resvd, x86.REG_BP)
}
gc.Thearch.ReservedRegs = resvd
}
func Ldmain() {
Bso = bufio.NewWriter(os.Stdout)
Ctxt = linknew(SysArch)
Ctxt.Diag = Diag
Ctxt.Bso = Bso
Debug = [128]int{}
nerrors = 0
outfile = ""
HEADTYPE = -1
INITTEXT = -1
INITDAT = -1
INITRND = -1
INITENTRY = ""
Linkmode = LinkAuto
// For testing behavior of go command when tools crash silently.
// Undocumented, not in standard flag parser to avoid
// exposing in usage message.
for _, arg := range os.Args {
if arg == "-crash_for_testing" {
os.Exit(2)
}
}
if SysArch.Family == sys.AMD64 && obj.Getgoos() == "plan9" {
obj.Flagcount("8", "use 64-bit addresses in symbol table", &Debug['8'])
}
obj.Flagfn1("B", "add an ELF NT_GNU_BUILD_ID `note` when using ELF", addbuildinfo)
obj.Flagcount("C", "check Go calls to C code", &Debug['C'])
obj.Flagint64("D", "set data segment `address`", &INITDAT)
obj.Flagstr("E", "set `entry` symbol name", &INITENTRY)
obj.Flagfn1("I", "use `linker` as ELF dynamic linker", setinterp)
obj.Flagfn1("L", "add specified `directory` to library path", Lflag)
obj.Flagfn1("H", "set header `type`", setheadtype)
obj.Flagint32("R", "set address rounding `quantum`", &INITRND)
obj.Flagint64("T", "set text segment `address`", &INITTEXT)
obj.Flagfn0("V", "print version and exit", doversion)
obj.Flagfn1("X", "add string value `definition` of the form importpath.name=value", addstrdata1)
obj.Flagcount("a", "disassemble output", &Debug['a'])
obj.Flagstr("buildid", "record `id` as Go toolchain build id", &buildid)
flag.Var(&Buildmode, "buildmode", "set build `mode`")
obj.Flagcount("c", "dump call graph", &Debug['c'])
obj.Flagcount("d", "disable dynamic executable", &Debug['d'])
flag.BoolVar(&flag_dumpdep, "dumpdep", false, "dump symbol dependency graph")
obj.Flagstr("extar", "archive program for buildmode=c-archive", &extar)
obj.Flagstr("extld", "use `linker` when linking in external mode", &extld)
obj.Flagstr("extldflags", "pass `flags` to external linker", &extldflags)
obj.Flagcount("f", "ignore version mismatch", &Debug['f'])
obj.Flagcount("g", "disable go package data checks", &Debug['g'])
obj.Flagcount("h", "halt on error", &Debug['h'])
obj.Flagstr("installsuffix", "set package directory `suffix`", &flag_installsuffix)
obj.Flagstr("k", "set field tracking `symbol`", &tracksym)
obj.Flagstr("libgcc", "compiler support lib for internal linking; use \"none\" to disable", &libgccfile)
obj.Flagfn1("linkmode", "set link `mode` (internal, external, auto)", setlinkmode)
flag.BoolVar(&Linkshared, "linkshared", false, "link against installed Go shared libraries")
obj.Flagcount("msan", "enable MSan interface", &flag_msan)
obj.Flagcount("n", "dump symbol table", &Debug['n'])
obj.Flagstr("o", "write output to `file`", &outfile)
flag.Var(&rpath, "r", "set the ELF dynamic linker search `path` to dir1:dir2:...")
obj.Flagcount("race", "enable race detector", &flag_race)
obj.Flagcount("s", "disable symbol table", &Debug['s'])
var flagShared int
if SysArch.InFamily(sys.ARM, sys.AMD64) {
obj.Flagcount("shared", "generate shared object (implies -linkmode external)", &flagShared)
}
obj.Flagstr("tmpdir", "use `directory` for temporary files", &tmpdir)
obj.Flagcount("u", "reject unsafe packages", &Debug['u'])
obj.Flagcount("v", "print link trace", &Debug['v'])
obj.Flagcount("w", "disable DWARF generation", &Debug['w'])
obj.Flagstr("cpuprofile", "write cpu profile to `file`", &cpuprofile)
obj.Flagstr("memprofile", "write memory profile to `file`", &memprofile)
obj.Flagint64("memprofilerate", "set runtime.MemProfileRate to `rate`", &memprofilerate)
obj.Flagparse(usage)
startProfile()
Ctxt.Bso = Bso
Ctxt.Debugvlog = int32(Debug['v'])
if flagShared != 0 {
if Buildmode == BuildmodeUnset {
Buildmode = BuildmodeCShared
} else if Buildmode != BuildmodeCShared {
Exitf("-shared and -buildmode=%s are incompatible", Buildmode.String())
}
}
if Buildmode == BuildmodeUnset {
Buildmode = BuildmodeExe
}
if Buildmode != BuildmodeShared && flag.NArg() != 1 {
usage()
}
if outfile == "" {
outfile = "a.out"
if HEADTYPE == obj.Hwindows {
outfile += ".exe"
}
}
libinit() // creates outfile
if HEADTYPE == -1 {
HEADTYPE = int32(headtype(goos))
}
Ctxt.Headtype = int(HEADTYPE)
if headstring == "" {
headstring = Headstr(int(HEADTYPE))
}
Thearch.Archinit()
if Linkshared && !Iself {
Exitf("-linkshared can only be used on elf systems")
}
if Debug['v'] != 0 {
fmt.Fprintf(Bso, "HEADER = -H%d -T0x%x -D0x%x -R0x%x\n", HEADTYPE, uint64(INITTEXT), uint64(INITDAT), uint32(INITRND))
}
Bso.Flush()
if Buildmode == BuildmodeShared {
for i := 0; i < flag.NArg(); i++ {
arg := flag.Arg(i)
parts := strings.SplitN(arg, "=", 2)
var pkgpath, file string
if len(parts) == 1 {
pkgpath, file = "main", arg
} else {
pkgpath, file = parts[0], parts[1]
}
pkglistfornote = append(pkglistfornote, pkgpath...)
pkglistfornote = append(pkglistfornote, '\n')
addlibpath(Ctxt, "command line", "command line", file, pkgpath, "")
}
} else {
addlibpath(Ctxt, "command line", "command line", flag.Arg(0), "main", "")
}
loadlib()
checkstrdata()
deadcode(Ctxt)
fieldtrack(Ctxt)
callgraph()
doelf()
if HEADTYPE == obj.Hdarwin {
domacho()
}
dostkcheck()
if HEADTYPE == obj.Hwindows {
dope()
}
addexport()
Thearch.Gentext() // trampolines, call stubs, etc.
textbuildid()
textaddress()
pclntab()
findfunctab()
symtab()
dodata()
address()
reloc()
Thearch.Asmb()
undef()
hostlink()
archive()
if Debug['v'] != 0 {
fmt.Fprintf(Bso, "%5.2f cpu time\n", obj.Cputime())
fmt.Fprintf(Bso, "%d symbols\n", len(Ctxt.Allsym))
fmt.Fprintf(Bso, "%d liveness data\n", liveness)
}
Bso.Flush()
errorexit()
}
func linknew(arch *sys.Arch) *Link {
ctxt := &Link{
Hash: []map[string]*LSym{
// preallocate about 2mb for hash of
// non static symbols
make(map[string]*LSym, 100000),
},
Allsym: make([]*LSym, 0, 100000),
Arch: arch,
Goroot: obj.Getgoroot(),
}
p := obj.Getgoarch()
if p != arch.Name {
log.Fatalf("invalid goarch %s (want %s)", p, arch.Name)
}
ctxt.Headtype = headtype(obj.Getgoos())
if ctxt.Headtype < 0 {
log.Fatalf("unknown goos %s", obj.Getgoos())
}
// Record thread-local storage offset.
// TODO(rsc): Move tlsoffset back into the linker.
switch ctxt.Headtype {
default:
log.Fatalf("unknown thread-local storage offset for %s", Headstr(ctxt.Headtype))
case obj.Hplan9, obj.Hwindows:
break
/*
* ELF uses TLS offset negative from FS.
* Translate 0(FS) and 8(FS) into -16(FS) and -8(FS).
* Known to low-level assembly in package runtime and runtime/cgo.
*/
case obj.Hlinux,
obj.Hfreebsd,
obj.Hnetbsd,
obj.Hopenbsd,
obj.Hdragonfly,
obj.Hsolaris:
if obj.Getgoos() == "android" {
switch ctxt.Arch.Family {
case sys.AMD64:
// Android/amd64 constant - offset from 0(FS) to our TLS slot.
// Explained in src/runtime/cgo/gcc_android_*.c
ctxt.Tlsoffset = 0x1d0
case sys.I386:
// Android/386 constant - offset from 0(GS) to our TLS slot.
ctxt.Tlsoffset = 0xf8
default:
ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize
}
} else {
ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize
}
case obj.Hnacl:
switch ctxt.Arch.Family {
default:
log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name)
case sys.ARM:
ctxt.Tlsoffset = 0
case sys.AMD64:
ctxt.Tlsoffset = 0
case sys.I386:
ctxt.Tlsoffset = -8
}
/*
* OS X system constants - offset from 0(GS) to our TLS.
* Explained in src/runtime/cgo/gcc_darwin_*.c.
*/
case obj.Hdarwin:
switch ctxt.Arch.Family {
default:
log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name)
case sys.ARM:
ctxt.Tlsoffset = 0 // dummy value, not needed
case sys.AMD64:
ctxt.Tlsoffset = 0x8a0
case sys.ARM64:
ctxt.Tlsoffset = 0 // dummy value, not needed
case sys.I386:
ctxt.Tlsoffset = 0x468
}
}
// On arm, record goarm.
if ctxt.Arch.Family == sys.ARM {
ctxt.Goarm = obj.Getgoarm()
}
return ctxt
}
}
// zero old range
p = zerorange(p, int64(frame), lo, hi)
// set new range
hi = n.Xoffset + n.Type.Width
lo = n.Xoffset
}
// zero final range
zerorange(p, int64(frame), lo, hi)
}
var darwin = obj.Getgoos() == "darwin"
func zerorange(p *obj.Prog, frame int64, lo int64, hi int64) *obj.Prog {
cnt := hi - lo
if cnt == 0 {
return p
}
if cnt < int64(4*gc.Widthptr) {
for i := int64(0); i < cnt; i += int64(gc.Widthptr) {
p = appendpp(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGSP, 8+frame+lo+i)
}
} else if cnt <= int64(128*gc.Widthptr) && !darwin { // darwin ld64 cannot handle BR26 reloc with non-zero addend
p = appendpp(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGSP, 0, obj.TYPE_REG, arm64.REGRT1, 0)
p = appendpp(p, arm64.AADD, obj.TYPE_CONST, 0, 8+frame+lo-8, obj.TYPE_REG, arm64.REGRT1, 0)
p.Reg = arm64.REGRT1
p = appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
func blockcopy(n, ns *gc.Node, osrc, odst, w int64) {
var noddi gc.Node
gc.Nodreg(&noddi, gc.Types[gc.Tptr], x86.REG_DI)
var nodsi gc.Node
gc.Nodreg(&nodsi, gc.Types[gc.Tptr], x86.REG_SI)
var nodl gc.Node
var nodr gc.Node
if n.Ullman >= ns.Ullman {
gc.Agenr(n, &nodr, &nodsi)
if ns.Op == gc.ONAME {
gc.Gvardef(ns)
}
gc.Agenr(ns, &nodl, &noddi)
} else {
if ns.Op == gc.ONAME {
gc.Gvardef(ns)
}
gc.Agenr(ns, &nodl, &noddi)
gc.Agenr(n, &nodr, &nodsi)
}
if nodl.Reg != x86.REG_DI {
gmove(&nodl, &noddi)
}
if nodr.Reg != x86.REG_SI {
gmove(&nodr, &nodsi)
}
gc.Regfree(&nodl)
gc.Regfree(&nodr)
c := w % 8 // bytes
q := w / 8 // quads
var oldcx gc.Node
var cx gc.Node
savex(x86.REG_CX, &cx, &oldcx, nil, gc.Types[gc.TINT64])
// if we are copying forward on the stack and
// the src and dst overlap, then reverse direction
if osrc < odst && odst < osrc+w {
// reverse direction
gins(x86.ASTD, nil, nil) // set direction flag
if c > 0 {
gconreg(addptr, w-1, x86.REG_SI)
gconreg(addptr, w-1, x86.REG_DI)
gconreg(movptr, c, x86.REG_CX)
gins(x86.AREP, nil, nil) // repeat
gins(x86.AMOVSB, nil, nil) // MOVB *(SI)-,*(DI)-
}
if q > 0 {
if c > 0 {
gconreg(addptr, -7, x86.REG_SI)
gconreg(addptr, -7, x86.REG_DI)
} else {
gconreg(addptr, w-8, x86.REG_SI)
gconreg(addptr, w-8, x86.REG_DI)
}
gconreg(movptr, q, x86.REG_CX)
gins(x86.AREP, nil, nil) // repeat
gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)-,*(DI)-
}
// we leave with the flag clear
gins(x86.ACLD, nil, nil)
} else {
// normal direction
if q > 128 || (gc.Nacl && q >= 4) || (obj.Getgoos() == "plan9" && q >= 4) {
gconreg(movptr, q, x86.REG_CX)
gins(x86.AREP, nil, nil) // repeat
gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+
} else if q >= 4 {
var oldx0 gc.Node
var x0 gc.Node
savex(x86.REG_X0, &x0, &oldx0, nil, gc.Types[gc.TFLOAT64])
p := gins(obj.ADUFFCOPY, nil, nil)
p.To.Type = obj.TYPE_ADDR
p.To.Sym = gc.Linksym(gc.Pkglookup("duffcopy", gc.Runtimepkg))
// 64 blocks taking 14 bytes each
// see ../../../../runtime/mkduff.go
p.To.Offset = 14 * (64 - q/2)
restx(&x0, &oldx0)
if q%2 != 0 {
gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+
}
} else if !gc.Nacl && c == 0 {
// We don't need the MOVSQ side-effect of updating SI and DI,
// and issuing a sequence of MOVQs directly is faster.
nodsi.Op = gc.OINDREG
noddi.Op = gc.OINDREG
for q > 0 {
gmove(&nodsi, &cx) // MOVQ x+(SI),CX
gmove(&cx, &noddi) // MOVQ CX,x+(DI)
nodsi.Xoffset += 8
noddi.Xoffset += 8
q--
}
} else {
for q > 0 {
gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+
q--
}
}
// copy the remaining c bytes
if w < 4 || c <= 1 || (odst < osrc && osrc < odst+w) {
for c > 0 {
gins(x86.AMOVSB, nil, nil) // MOVB *(SI)+,*(DI)+
c--
}
} else if w < 8 || c <= 4 {
nodsi.Op = gc.OINDREG
noddi.Op = gc.OINDREG
cx.Type = gc.Types[gc.TINT32]
nodsi.Type = gc.Types[gc.TINT32]
noddi.Type = gc.Types[gc.TINT32]
if c > 4 {
nodsi.Xoffset = 0
noddi.Xoffset = 0
gmove(&nodsi, &cx)
gmove(&cx, &noddi)
}
nodsi.Xoffset = c - 4
noddi.Xoffset = c - 4
gmove(&nodsi, &cx)
gmove(&cx, &noddi)
} else {
nodsi.Op = gc.OINDREG
noddi.Op = gc.OINDREG
cx.Type = gc.Types[gc.TINT64]
nodsi.Type = gc.Types[gc.TINT64]
noddi.Type = gc.Types[gc.TINT64]
nodsi.Xoffset = c - 8
noddi.Xoffset = c - 8
gmove(&nodsi, &cx)
gmove(&cx, &noddi)
}
}
restx(&cx, &oldcx)
}
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package amd64
import (
"cmd/avail/obj"
"cmd/avail/obj/x86"
"cmd/compile/avail/gc"
)
// no floating point in note handlers on Plan 9
var isPlan9 = obj.Getgoos() == "plan9"
func defframe(ptxt *obj.Prog) {
// fill in argument size, stack size
ptxt.To.Type = obj.TYPE_TEXTSIZE
ptxt.To.Val = int32(gc.Rnd(gc.Curfn.Type.ArgWidth(), int64(gc.Widthptr)))
frame := uint32(gc.Rnd(gc.Stksize+gc.Maxarg, int64(gc.Widthreg)))
ptxt.To.Offset = int64(frame)
// insert code to zero ambiguously live variables
// so that the garbage collector only sees initialized values
// when it looks for pointers.
p := ptxt
hi := int64(0)
lo := hi
ax := uint32(0)
func Main() {
defer hidePanic()
goarch = obj.Getgoarch()
Ctxt = obj.Linknew(Thearch.LinkArch)
Ctxt.DiagFunc = Yyerror
bstdout = bufio.NewWriter(os.Stdout)
Ctxt.Bso = bstdout
localpkg = mkpkg("")
localpkg.Prefix = "\"\""
autopkg = mkpkg("")
autopkg.Prefix = "\"\""
// pseudo-package, for scoping
builtinpkg = mkpkg("go.builtin")
builtinpkg.Prefix = "go.builtin" // not go%2ebuiltin
// pseudo-package, accessed by import "unsafe"
unsafepkg = mkpkg("unsafe")
unsafepkg.Name = "unsafe"
// real package, referred to by generated runtime calls
Runtimepkg = mkpkg("runtime")
Runtimepkg.Name = "runtime"
// pseudo-packages used in symbol tables
itabpkg = mkpkg("go.itab")
itabpkg.Name = "go.itab"
itabpkg.Prefix = "go.itab" // not go%2eitab
itablinkpkg = mkpkg("go.itablink")
itablinkpkg.Name = "go.itablink"
itablinkpkg.Prefix = "go.itablink" // not go%2eitablink
trackpkg = mkpkg("go.track")
trackpkg.Name = "go.track"
trackpkg.Prefix = "go.track" // not go%2etrack
typepkg = mkpkg("type")
typepkg.Name = "type"
// pseudo-package used for map zero values
mappkg = mkpkg("go.map")
mappkg.Name = "go.map"
mappkg.Prefix = "go.map"
goroot = obj.Getgoroot()
goos = obj.Getgoos()
Nacl = goos == "nacl"
if Nacl {
flag_largemodel = true
}
flag.BoolVar(&compiling_runtime, "+", false, "compiling runtime")
obj.Flagcount("%", "debug non-static initializers", &Debug['%'])
obj.Flagcount("A", "for bootstrapping, allow 'any' type", &Debug['A'])
obj.Flagcount("B", "disable bounds checking", &Debug['B'])
flag.StringVar(&localimport, "D", "", "set relative `path` for local imports")
obj.Flagcount("E", "debug symbol export", &Debug['E'])
obj.Flagfn1("I", "add `directory` to import search path", addidir)
obj.Flagcount("K", "debug missing line numbers", &Debug['K'])
obj.Flagcount("M", "debug move generation", &Debug['M'])
obj.Flagcount("N", "disable optimizations", &Debug['N'])
obj.Flagcount("P", "debug peephole optimizer", &Debug['P'])
obj.Flagcount("R", "debug register optimizer", &Debug['R'])
obj.Flagcount("S", "print assembly listing", &Debug['S'])
obj.Flagfn0("V", "print compiler version", doversion)
obj.Flagcount("W", "debug parse tree after type checking", &Debug['W'])
flag.StringVar(&asmhdr, "asmhdr", "", "write assembly header to `file`")
flag.StringVar(&buildid, "buildid", "", "record `id` as the build id in the export metadata")
flag.BoolVar(&pure_go, "complete", false, "compiling complete package (no C or assembly)")
flag.StringVar(&debugstr, "d", "", "print debug information about items in `list`")
obj.Flagcount("e", "no limit on number of errors reported", &Debug['e'])
obj.Flagcount("f", "debug stack frames", &Debug['f'])
obj.Flagcount("g", "debug code generation", &Debug['g'])
obj.Flagcount("h", "halt on error", &Debug['h'])
obj.Flagcount("i", "debug line number stack", &Debug['i'])
obj.Flagfn1("importmap", "add `definition` of the form source=actual to import map", addImportMap)
flag.StringVar(&flag_installsuffix, "installsuffix", "", "set pkg directory `suffix`")
obj.Flagcount("j", "debug runtime-initialized variables", &Debug['j'])
obj.Flagcount("l", "disable inlining", &Debug['l'])
flag.StringVar(&linkobj, "linkobj", "", "write linker-specific object to `file`")
obj.Flagcount("live", "debug liveness analysis", &debuglive)
obj.Flagcount("m", "print optimization decisions", &Debug['m'])
flag.BoolVar(&flag_msan, "msan", false, "build code compatible with C/C++ memory sanitizer")
flag.BoolVar(&newexport, "newexport", true, "use new export format") // TODO(gri) remove eventually (issue 15323)
flag.BoolVar(&nolocalimports, "nolocalimports", false, "reject local (relative) imports")
flag.StringVar(&outfile, "o", "", "write output to `file`")
flag.StringVar(&myimportpath, "p", "", "set expected package import `path`")
flag.BoolVar(&writearchive, "pack", false, "write package file instead of object file")
obj.Flagcount("r", "debug generated wrappers", &Debug['r'])
flag.BoolVar(&flag_race, "race", false, "enable race detector")
obj.Flagcount("s", "warn about composite literals that can be simplified", &Debug['s'])
flag.StringVar(&Ctxt.LineHist.TrimPathPrefix, "trimpath", "", "remove `prefix` from recorded source file paths")
flag.BoolVar(&safemode, "u", false, "reject unsafe code")
obj.Flagcount("v", "increase debug verbosity", &Debug['v'])
obj.Flagcount("w", "debug type checking", &Debug['w'])
flag.BoolVar(&use_writebarrier, "wb", true, "enable write barrier")
obj.Flagcount("x", "debug lexer", &Debug['x'])
var flag_shared bool
var flag_dynlink bool
if supportsDynlink(Thearch.LinkArch.Arch) {
flag.BoolVar(&flag_shared, "shared", false, "generate code that can be linked into a shared library")
flag.BoolVar(&flag_dynlink, "dynlink", false, "support references to Go symbols defined in other shared libraries")
}
if Thearch.LinkArch.Family == sys.AMD64 {
flag.BoolVar(&flag_largemodel, "largemodel", false, "generate code that assumes a large memory model")
}
flag.StringVar(&cpuprofile, "cpuprofile", "", "write cpu profile to `file`")
flag.StringVar(&memprofile, "memprofile", "", "write memory profile to `file`")
flag.Int64Var(&memprofilerate, "memprofilerate", 0, "set runtime.MemProfileRate to `rate`")
flag.BoolVar(&ssaEnabled, "ssa", true, "use SSA backend to generate code")
obj.Flagparse(usage)
Ctxt.Flag_shared = flag_dynlink || flag_shared
Ctxt.Flag_dynlink = flag_dynlink
Ctxt.Flag_optimize = Debug['N'] == 0
Ctxt.Debugasm = int32(Debug['S'])
Ctxt.Debugvlog = int32(Debug['v'])
if flag.NArg() < 1 {
usage()
}
startProfile()
if flag_race {
racepkg = mkpkg("runtime/race")
racepkg.Name = "race"
}
if flag_msan {
msanpkg = mkpkg("runtime/msan")
msanpkg.Name = "msan"
}
if flag_race && flag_msan {
log.Fatal("cannot use both -race and -msan")
} else if flag_race || flag_msan {
instrumenting = true
}
// parse -d argument
if debugstr != "" {
Split:
for _, name := range strings.Split(debugstr, ",") {
if name == "" {
continue
}
val := 1
if i := strings.Index(name, "="); i >= 0 {
var err error
val, err = strconv.Atoi(name[i+1:])
if err != nil {
log.Fatalf("invalid debug value %v", name)
}
name = name[:i]
}
for _, t := range debugtab {
if t.name == name {
if t.val != nil {
*t.val = val
continue Split
}
}
}
// special case for ssa for now
if strings.HasPrefix(name, "ssa/") {
// expect form ssa/phase/flag
// e.g. -d=ssa/generic_cse/time
// _ in phase name also matches space
phase := name[4:]
flag := "debug" // default flag is debug
if i := strings.Index(phase, "/"); i >= 0 {
flag = phase[i+1:]
phase = phase[:i]
}
err := ssa.PhaseOption(phase, flag, val)
if err != "" {
log.Fatalf(err)
}
continue Split
}
log.Fatalf("unknown debug key -d %s\n", name)
}
}
// enable inlining. for now:
// default: inlining on. (debug['l'] == 1)
// -l: inlining off (debug['l'] == 0)
// -ll, -lll: inlining on again, with extra debugging (debug['l'] > 1)
if Debug['l'] <= 1 {
Debug['l'] = 1 - Debug['l']
}
Thearch.Betypeinit()
Widthint = Thearch.LinkArch.IntSize
Widthptr = Thearch.LinkArch.PtrSize
Widthreg = Thearch.LinkArch.RegSize
initUniverse()
blockgen = 1
dclcontext = PEXTERN
nerrors = 0
lexlineno = 1
loadsys()
for _, infile = range flag.Args() {
if trace && Debug['x'] != 0 {
fmt.Printf("--- %s ---\n", infile)
}
linehistpush(infile)
f, err := os.Open(infile)
if err != nil {
fmt.Printf("open %s: %v\n", infile, err)
errorexit()
}
bin := bufio.NewReader(f)
// Skip initial BOM if present.
if r, _, _ := bin.ReadRune(); r != BOM {
bin.UnreadRune()
}
block = 1
iota_ = -1000000
imported_unsafe = false
parse_file(bin)
if nsyntaxerrors != 0 {
errorexit()
}
// Instead of converting EOF into '\n' in getc and count it as an extra line
// for the line history to work, and which then has to be corrected elsewhere,
// just add a line here.
lexlineno++
linehistpop()
f.Close()
}
testdclstack()
mkpackage(localpkg.Name) // final import not used checks
finishUniverse()
typecheckok = true
if Debug['f'] != 0 {
frame(1)
}
// Process top-level declarations in phases.
// Phase 1: const, type, and names and types of funcs.
// This will gather all the information about types
// and methods but doesn't depend on any of it.
defercheckwidth()
// Don't use range--typecheck can add closures to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op != ODCL && xtop[i].Op != OAS && xtop[i].Op != OAS2 {
xtop[i] = typecheck(xtop[i], Etop)
}
}
// Phase 2: Variable assignments.
// To check interface assignments, depends on phase 1.
// Don't use range--typecheck can add closures to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op == ODCL || xtop[i].Op == OAS || xtop[i].Op == OAS2 {
xtop[i] = typecheck(xtop[i], Etop)
}
}
resumecheckwidth()
// Phase 3: Type check function bodies.
// Don't use range--typecheck can add closures to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op == ODCLFUNC || xtop[i].Op == OCLOSURE {
Curfn = xtop[i]
decldepth = 1
saveerrors()
typecheckslice(Curfn.Nbody.Slice(), Etop)
checkreturn(Curfn)
if nerrors != 0 {
Curfn.Nbody.Set(nil) // type errors; do not compile
}
}
}
// Phase 4: Decide how to capture closed variables.
// This needs to run before escape analysis,
// because variables captured by value do not escape.
for _, n := range xtop {
if n.Op == ODCLFUNC && n.Func.Closure != nil {
Curfn = n
capturevars(n)
}
}
Curfn = nil
if nsavederrors+nerrors != 0 {
errorexit()
}
// Phase 5: Inlining
if Debug['l'] > 1 {
// Typecheck imported function bodies if debug['l'] > 1,
// otherwise lazily when used or re-exported.
for _, n := range importlist {
if n.Func.Inl.Len() != 0 {
saveerrors()
typecheckinl(n)
}
}
if nsavederrors+nerrors != 0 {
errorexit()
}
}
if Debug['l'] != 0 {
// Find functions that can be inlined and clone them before walk expands them.
visitBottomUp(xtop, func(list []*Node, recursive bool) {
for _, n := range list {
if n.Op == ODCLFUNC {
caninl(n)
inlcalls(n)
}
}
})
}
// Phase 6: Escape analysis.
// Required for moving heap allocations onto stack,
// which in turn is required by the closure implementation,
// which stores the addresses of stack variables into the closure.
// If the closure does not escape, it needs to be on the stack
// or else the stack copier will not update it.
// Large values are also moved off stack in escape analysis;
// because large values may contain pointers, it must happen early.
escapes(xtop)
// Phase 7: Transform closure bodies to properly reference captured variables.
// This needs to happen before walk, because closures must be transformed
// before walk reaches a call of a closure.
for _, n := range xtop {
if n.Op == ODCLFUNC && n.Func.Closure != nil {
Curfn = n
transformclosure(n)
}
}
Curfn = nil
// Phase 8: Compile top level functions.
// Don't use range--walk can add functions to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op == ODCLFUNC {
funccompile(xtop[i])
}
}
if nsavederrors+nerrors == 0 {
fninit(xtop)
}
if compiling_runtime {
checknowritebarrierrec()
}
// Phase 9: Check external declarations.
for i, n := range externdcl {
if n.Op == ONAME {
externdcl[i] = typecheck(externdcl[i], Erv)
}
}
if nerrors+nsavederrors != 0 {
errorexit()
}
dumpobj()
if asmhdr != "" {
dumpasmhdr()
}
if nerrors+nsavederrors != 0 {
errorexit()
}
Flusherrors()
}
func importfile(f *Val, indent []byte) {
if importpkg != nil {
Fatalf("importpkg not nil")
}
path_, ok := f.U.(string)
if !ok {
Yyerror("import statement not a string")
return
}
if len(path_) == 0 {
Yyerror("import path is empty")
return
}
if isbadimport(path_) {
return
}
// The package name main is no longer reserved,
// but we reserve the import path "main" to identify
// the main package, just as we reserve the import
// path "math" to identify the standard math package.
if path_ == "main" {
Yyerror("cannot import \"main\"")
errorexit()
}
if myimportpath != "" && path_ == myimportpath {
Yyerror("import %q while compiling that package (import cycle)", path_)
errorexit()
}
if mapped, ok := importMap[path_]; ok {
path_ = mapped
}
if path_ == "unsafe" {
if safemode {
Yyerror("cannot import package unsafe")
errorexit()
}
importpkg = unsafepkg
imported_unsafe = true
return
}
if islocalname(path_) {
if path_[0] == '/' {
Yyerror("import path cannot be absolute path")
return
}
prefix := Ctxt.Pathname
if localimport != "" {
prefix = localimport
}
path_ = path.Join(prefix, path_)
if isbadimport(path_) {
return
}
}
file, found := findpkg(path_)
if !found {
Yyerror("can't find import: %q", path_)
errorexit()
}
importpkg = mkpkg(path_)
if importpkg.Imported {
return
}
importpkg.Imported = true
impf, err := os.Open(file)
if err != nil {
Yyerror("can't open import: %q: %v", path_, err)
errorexit()
}
defer impf.Close()
imp := bufio.NewReader(impf)
if strings.HasSuffix(file, ".a") {
if !skiptopkgdef(imp) {
Yyerror("import %s: not a package file", file)
errorexit()
}
}
// check object header
p, err := imp.ReadString('\n')
if err != nil {
log.Fatalf("reading input: %v", err)
}
if len(p) > 0 {
p = p[:len(p)-1]
}
if p != "empty archive" {
if !strings.HasPrefix(p, "go object ") {
Yyerror("import %s: not a go object file: %s", file, p)
errorexit()
}
q := fmt.Sprintf("%s %s %s %s", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring())
if p[10:] != q {
Yyerror("import %s: object is [%s] expected [%s]", file, p[10:], q)
errorexit()
}
}
// process header lines
for {
p, err = imp.ReadString('\n')
if err != nil {
log.Fatalf("reading input: %v", err)
}
if p == "\n" {
break // header ends with blank line
}
if strings.HasPrefix(p, "safe") {
importpkg.Safe = true
break // ok to ignore rest
}
}
// assume files move (get installed)
// so don't record the full path.
linehistpragma(file[len(file)-len(path_)-2:]) // acts as #pragma lib
// In the importfile, if we find:
// $$\n (old format): position the input right after $$\n and return
// $$B\n (new format): import directly, then feed the lexer a dummy statement
// look for $$
var c byte
for {
c, err = imp.ReadByte()
if err != nil {
break
}
if c == '$' {
c, err = imp.ReadByte()
if c == '$' || err != nil {
break
}
}
}
// get character after $$
if err == nil {
c, _ = imp.ReadByte()
}
switch c {
case '\n':
// old export format
parse_import(imp, indent)
case 'B':
// new export format
if Debug_export != 0 {
fmt.Printf("importing %s (%s)\n", path_, file)
}
imp.ReadByte() // skip \n after $$B
Import(imp)
default:
Yyerror("no import in %q", path_)
errorexit()
}
if safemode && !importpkg.Safe {
Yyerror("cannot import unsafe package %q", importpkg.Path)
}
}